Skip to main content
Log in

Aminochrome Induces Neuroinflammation and Dopaminergic Neuronal Loss: A New Preclinical Model to Find Anti-inflammatory and Neuroprotective Drugs for Parkinson’s Disease

  • Original Research
  • Published:
Cellular and Molecular Neurobiology Aims and scope Submit manuscript

Abstract

Studies have suggested aminochrome as an endogenous neurotoxin responsible for the dopaminergic neuron degeneration in Parkinson’s disease (PD). However, neuroinflammation, an important alteration in PD pathogenesis, has been strictly induced in vitro by aminochrome. The aim of this study was to characterize the neuroinflammation induced in vivo by aminochrome. Wistar rats (male, 250–270 g) received a unilateral single dose by stereotaxic injection of saline into three sites in the striatum in the negative control group, or 32 nmol 6-hydroxydopamine (6-OHDA) in the positive control, or 6 nmol aminochrome. After 14 days, histological and molecular analyses were performed. We observed by immunofluorescence that aminochrome, as well as 6-OHDA, induced an increase in the number of Iba-1+ cells and in the number of activated (Iba-1+/ CD68+) microglia. An increase in the number of S100b+ cells and in the GFAP expression were also evidenced in the striatum and the SNpc of animals from aminochrome and positive control group. Dopaminergic neuronal loss was marked by reduction of TH+ cells and confirmed with reduction in the number of Nissl-stained neurons in the SNpc of rats from aminochrome and positive control groups. In addition, we observed by qPCR that aminocrhome induced an increase in the levels of IL-1β, TNF-α, NLRP3, CCL5 and CCR2 mRNA in the SNpc. This work provides the first evidence of microgliosis, astrogliosis and neuroinflammation induced by aminochrome in an in vivo model. Since aminochrome is an endogenous molecule derived from dopamine oxidation present in the targeted neurons in PD, these results reinforce the potential of aminochrome as a useful preclinical model to find anti-inflammatory and neuroprotective drugs for PD.

Graphical Abstract

Aminochrome induced dopaminergic neuronal loss, microglial activation, astroglial activation and neuroinflammation marked by an increase in NLRP3, IL1β, TNF-α, CCL2, CCL5 and CCR2.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6

Similar content being viewed by others

Data Availability

The list of primary antibodies used is available in the Table 1. A Summary of mean, standard deviation and p value from histological analyses is available in the Table 2. Other data sets are available by the authors upon reasonable requests.

Code Availability

Not applicable.

References

Download references

Acknowledgements

The authors thank the post-graduate program in Immunology at the Federal University of Bahia. This work was supported by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPQ – Brazil), Coordenação de Apoio de Pessoal de Nível Superior (CAPES- Brazil), Federación Española de Parkinson (Spain) and Fundación Séneca (Spain).

Funding

F.M.A. thanks Coordenação de Apoio de Pessoal de Nível Superior (PDSE -47/2017) for its support; L.C.B. thanks the Spanish Ministry of Science, Innovation and Universities (FPU 18/02549) for its support; M.T.H. thanks the Federación Española de Parkinson (FIS PI13 01293) and the Fundación Séneca (19540/PI/14) for its support; V.D.A.S and S.L.C. thank Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPQ E. Universal/2018—429127/2018-9; and CNPQ—Research Fellowship) for its support. We are thankful to Biorender for the creation of the figures.

Author information

Authors and Affiliations

Authors

Contributions

Conception and design of the study (VDAS, MTH); acquisition of data (FMA, AFF, LBJ, TCM, LC-B, CS-R, KMSF); analysis and interpretation of data (JVRO, MFDC, JS-A, SLC, VDAS and MTH); drafting of the article or critical review for important intellectual content (SLC, VDAS and MTH).

Corresponding authors

Correspondence to Maria Trinidad Herrero or Victor Diógenes Amaral Silva.

Ethics declarations

Conflict of interest

The authors declare no conflicts/competing interests.

Ethical Approval

All animal experiments were approved by the Institute of Health Science from Federal University of Bahia—Brazil Ethical Committee for animal experiments (CEUA Protocol n ° 011/2017).

Consent to Participate

Not applicable.

Consent for Publication

All authors approve of this submission for publication.

Additional information

Publisher's Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

De Araújo, F.M., Frota, A.F., de Jesus, L.B. et al. Aminochrome Induces Neuroinflammation and Dopaminergic Neuronal Loss: A New Preclinical Model to Find Anti-inflammatory and Neuroprotective Drugs for Parkinson’s Disease. Cell Mol Neurobiol 43, 265–281 (2023). https://doi.org/10.1007/s10571-021-01173-5

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s10571-021-01173-5

Keywords

Navigation